HDFS-7208. NN doesn't schedule replication when a DN storage fails. Contributed by Ming Ma
This commit is contained in:
Tsz-Wo Nicholas Sze
parent
76cf2250de
commit
603293da92
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@ -607,6 +607,9 @@ Release 2.6.0 - UNRELEASED
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HDFS-7185. The active NameNode will not accept an fsimage sent from the
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standby during rolling upgrade. (jing9)
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HDFS-7208. NN doesn't schedule replication when a DN storage fails.
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(Ming Ma via szetszwo)
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BREAKDOWN OF HDFS-6134 AND HADOOP-10150 SUBTASKS AND RELATED JIRAS
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HDFS-6387. HDFS CLI admin tool for creating & deleting an
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@ -1058,6 +1058,19 @@ public class BlockManager {
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}
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}
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/** Remove the blocks associated to the given DatanodeStorageInfo. */
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void removeBlocksAssociatedTo(final DatanodeStorageInfo storageInfo) {
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assert namesystem.hasWriteLock();
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final Iterator<? extends Block> it = storageInfo.getBlockIterator();
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DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
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while(it.hasNext()) {
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Block block = it.next();
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removeStoredBlock(block, node);
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invalidateBlocks.remove(node, block);
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}
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namesystem.checkSafeMode();
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}
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/**
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* Adds block to list of blocks which will be invalidated on specified
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* datanode and log the operation
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@ -722,6 +722,12 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
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logNodeIsNotChosen(storage, "storage is read-only");
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return false;
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}
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if (storage.getState() == State.FAILED) {
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logNodeIsNotChosen(storage, "storage has failed");
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return false;
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}
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DatanodeDescriptor node = storage.getDatanodeDescriptor();
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// check if the node is (being) decommissioned
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if (node.isDecommissionInProgress() || node.isDecommissioned()) {
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@ -21,11 +21,13 @@ import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.Queue;
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import java.util.Set;
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import com.google.common.annotations.VisibleForTesting;
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@ -224,13 +226,16 @@ public class DatanodeDescriptor extends DatanodeInfo {
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// The number of replication work pending before targets are determined
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private int PendingReplicationWithoutTargets = 0;
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// HB processing can use it to tell if it is the first HB since DN restarted
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private boolean heartbeatedSinceRegistration = false;
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/**
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* DatanodeDescriptor constructor
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* @param nodeID id of the data node
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*/
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public DatanodeDescriptor(DatanodeID nodeID) {
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super(nodeID);
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updateHeartbeat(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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updateHeartbeatState(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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}
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/**
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@ -241,7 +246,7 @@ public class DatanodeDescriptor extends DatanodeInfo {
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public DatanodeDescriptor(DatanodeID nodeID,
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String networkLocation) {
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super(nodeID, networkLocation);
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updateHeartbeat(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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updateHeartbeatState(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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}
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@VisibleForTesting
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@ -343,10 +348,48 @@ public class DatanodeDescriptor extends DatanodeInfo {
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*/
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public void updateHeartbeat(StorageReport[] reports, long cacheCapacity,
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long cacheUsed, int xceiverCount, int volFailures) {
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updateHeartbeatState(reports, cacheCapacity, cacheUsed, xceiverCount,
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volFailures);
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heartbeatedSinceRegistration = true;
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}
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/**
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* process datanode heartbeat or stats initialization.
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*/
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public void updateHeartbeatState(StorageReport[] reports, long cacheCapacity,
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long cacheUsed, int xceiverCount, int volFailures) {
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long totalCapacity = 0;
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long totalRemaining = 0;
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long totalBlockPoolUsed = 0;
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long totalDfsUsed = 0;
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Set<DatanodeStorageInfo> failedStorageInfos = null;
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// Decide if we should check for any missing StorageReport and mark it as
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// failed. There are different scenarios.
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// 1. When DN is running, a storage failed. Given the current DN
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// implementation doesn't add recovered storage back to its storage list
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// until DN restart, we can assume volFailures won't decrease
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// during the current DN registration session.
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// When volumeFailures == this.volumeFailures, it implies there is no
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// state change. No need to check for failed storage. This is an
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// optimization.
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// 2. After DN restarts, volFailures might not increase and it is possible
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// we still have new failed storage. For example, admins reduce
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// available storages in configuration. Another corner case
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// is the failed volumes might change after restart; a) there
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// is one good storage A, one restored good storage B, so there is
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// one element in storageReports and that is A. b) A failed. c) Before
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// DN sends HB to NN to indicate A has failed, DN restarts. d) After DN
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// restarts, storageReports has one element which is B.
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boolean checkFailedStorages = (volFailures > this.volumeFailures) ||
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!heartbeatedSinceRegistration;
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if (checkFailedStorages) {
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LOG.info("Number of failed storage changes from "
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+ this.volumeFailures + " to " + volFailures);
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failedStorageInfos = new HashSet<DatanodeStorageInfo>(
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storageMap.values());
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}
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setCacheCapacity(cacheCapacity);
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setCacheUsed(cacheUsed);
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@ -355,6 +398,10 @@ public class DatanodeDescriptor extends DatanodeInfo {
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this.volumeFailures = volFailures;
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for (StorageReport report : reports) {
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DatanodeStorageInfo storage = updateStorage(report.getStorage());
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if (checkFailedStorages) {
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failedStorageInfos.remove(storage);
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}
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storage.receivedHeartbeat(report);
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totalCapacity += report.getCapacity();
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totalRemaining += report.getRemaining();
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@ -368,6 +415,19 @@ public class DatanodeDescriptor extends DatanodeInfo {
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setRemaining(totalRemaining);
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setBlockPoolUsed(totalBlockPoolUsed);
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setDfsUsed(totalDfsUsed);
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if (checkFailedStorages) {
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updateFailedStorage(failedStorageInfos);
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}
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}
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private void updateFailedStorage(
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Set<DatanodeStorageInfo> failedStorageInfos) {
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for (DatanodeStorageInfo storageInfo : failedStorageInfos) {
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if (storageInfo.getState() != DatanodeStorage.State.FAILED) {
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LOG.info(storageInfo + " failed.");
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storageInfo.setState(DatanodeStorage.State.FAILED);
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}
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}
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}
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private static class BlockIterator implements Iterator<BlockInfo> {
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@ -641,6 +701,7 @@ public class DatanodeDescriptor extends DatanodeInfo {
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for(DatanodeStorageInfo storage : getStorageInfos()) {
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storage.setBlockReportCount(0);
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}
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heartbeatedSinceRegistration = false;
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}
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/**
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@ -183,6 +183,14 @@ public class DatanodeStorageInfo {
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return this.state;
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}
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void setState(State state) {
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this.state = state;
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}
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boolean areBlocksOnFailedStorage() {
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return getState() == State.FAILED && numBlocks != 0;
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}
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String getStorageID() {
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return storageID;
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}
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@ -192,7 +192,7 @@ class HeartbeatManager implements DatanodeStatistics {
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addDatanode(d);
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//update its timestamp
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d.updateHeartbeat(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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d.updateHeartbeatState(StorageReport.EMPTY_ARRAY, 0L, 0L, 0, 0);
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}
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}
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@ -242,6 +242,25 @@ class HeartbeatManager implements DatanodeStatistics {
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* While removing dead datanodes, make sure that only one datanode is marked
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* dead at a time within the synchronized section. Otherwise, a cascading
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* effect causes more datanodes to be declared dead.
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* Check if there are any failed storage and if so,
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* Remove all the blocks on the storage. It also covers the following less
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* common scenarios. After DatanodeStorage is marked FAILED, it is still
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* possible to receive IBR for this storage.
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* 1) DN could deliver IBR for failed storage due to its implementation.
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* a) DN queues a pending IBR request.
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* b) The storage of the block fails.
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* c) DN first sends HB, NN will mark the storage FAILED.
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* d) DN then sends the pending IBR request.
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* 2) SBN processes block request from pendingDNMessages.
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* It is possible to have messages in pendingDNMessages that refer
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* to some failed storage.
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* a) SBN receives a IBR and put it in pendingDNMessages.
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* b) The storage of the block fails.
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* c) Edit log replay get the IBR from pendingDNMessages.
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* Alternatively, we can resolve these scenarios with the following approaches.
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* A. Make sure DN don't deliver IBR for failed storage.
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* B. Remove all blocks in PendingDataNodeMessages for the failed storage
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* when we remove all blocks from BlocksMap for that storage.
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*/
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void heartbeatCheck() {
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final DatanodeManager dm = blockManager.getDatanodeManager();
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@ -254,6 +273,10 @@ class HeartbeatManager implements DatanodeStatistics {
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while (!allAlive) {
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// locate the first dead node.
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DatanodeID dead = null;
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// locate the first failed storage that isn't on a dead node.
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DatanodeStorageInfo failedStorage = null;
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// check the number of stale nodes
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int numOfStaleNodes = 0;
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int numOfStaleStorages = 0;
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@ -271,16 +294,23 @@ class HeartbeatManager implements DatanodeStatistics {
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if (storageInfo.areBlockContentsStale()) {
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numOfStaleStorages++;
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}
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if (failedStorage == null &&
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storageInfo.areBlocksOnFailedStorage() &&
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d != dead) {
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failedStorage = storageInfo;
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}
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}
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}
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// Set the number of stale nodes in the DatanodeManager
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dm.setNumStaleNodes(numOfStaleNodes);
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dm.setNumStaleStorages(numOfStaleStorages);
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}
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allAlive = dead == null;
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if (!allAlive) {
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allAlive = dead == null && failedStorage == null;
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if (dead != null) {
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// acquire the fsnamesystem lock, and then remove the dead node.
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namesystem.writeLock();
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try {
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@ -294,6 +324,20 @@ class HeartbeatManager implements DatanodeStatistics {
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namesystem.writeUnlock();
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}
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}
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if (failedStorage != null) {
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// acquire the fsnamesystem lock, and remove blocks on the storage.
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namesystem.writeLock();
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try {
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if (namesystem.isInStartupSafeMode()) {
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return;
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}
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synchronized(this) {
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blockManager.removeBlocksAssociatedTo(failedStorage);
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}
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} finally {
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namesystem.writeUnlock();
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}
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}
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}
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}
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@ -39,7 +39,9 @@ public class DatanodeStorage {
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* property should be used for debugging purposes only.
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* </p>
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*/
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READ_ONLY_SHARED;
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READ_ONLY_SHARED,
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FAILED;
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}
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private final String storageID;
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@ -214,6 +214,25 @@ public class BlockManagerTestUtil {
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bm.getDatanodeManager().getHeartbeatManager().heartbeatCheck();
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}
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/**
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* Call heartbeat check function of HeartbeatManager and get
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* under replicated blocks count within write lock to make sure
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* computeDatanodeWork doesn't interfere.
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* @param namesystem the FSNamesystem
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* @param bm the BlockManager to manipulate
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* @return the number of under replicated blocks
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*/
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public static int checkHeartbeatAndGetUnderReplicatedBlocksCount(
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FSNamesystem namesystem, BlockManager bm) {
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namesystem.writeLock();
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try {
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bm.getDatanodeManager().getHeartbeatManager().heartbeatCheck();
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return bm.getUnderReplicatedNotMissingBlocks();
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} finally {
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namesystem.writeUnlock();
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}
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}
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public static DatanodeStorageInfo updateStorage(DatanodeDescriptor dn,
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DatanodeStorage s) {
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return dn.updateStorage(s);
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@ -19,6 +19,8 @@ package org.apache.hadoop.hdfs.server.datanode;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assume.assumeTrue;
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import java.io.File;
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import java.io.FilenameFilter;
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@ -52,6 +54,7 @@ import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
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import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
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import org.apache.hadoop.hdfs.protocol.LocatedBlock;
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import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
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import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
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import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
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import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
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import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
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@ -79,6 +82,7 @@ public class TestDataNodeVolumeFailure {
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File dataDir = null;
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File data_fail = null;
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File failedDir = null;
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private FileSystem fs;
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// mapping blocks to Meta files(physical files) and locs(NameNode locations)
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private class BlockLocs {
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@ -97,6 +101,8 @@ public class TestDataNodeVolumeFailure {
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conf.setInt(DFSConfigKeys.DFS_DATANODE_FAILED_VOLUMES_TOLERATED_KEY, 1);
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cluster = new MiniDFSCluster.Builder(conf).numDataNodes(dn_num).build();
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cluster.waitActive();
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fs = cluster.getFileSystem();
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dataDir = new File(cluster.getDataDirectory());
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}
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@After
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@ -110,6 +116,10 @@ public class TestDataNodeVolumeFailure {
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if(cluster != null) {
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cluster.shutdown();
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}
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for (int i = 0; i < 3; i++) {
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FileUtil.setExecutable(new File(dataDir, "data"+(2*i+1)), true);
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FileUtil.setExecutable(new File(dataDir, "data"+(2*i+2)), true);
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}
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}
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/*
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@ -119,8 +129,6 @@ public class TestDataNodeVolumeFailure {
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*/
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@Test
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public void testVolumeFailure() throws Exception {
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FileSystem fs = cluster.getFileSystem();
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dataDir = new File(cluster.getDataDirectory());
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System.out.println("Data dir: is " + dataDir.getPath());
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@ -192,6 +200,39 @@ public class TestDataNodeVolumeFailure {
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" is created and replicated");
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}
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/**
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* Test that there are under replication blocks after vol failures
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*/
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@Test
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public void testUnderReplicationAfterVolFailure() throws Exception {
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// Bring up one more datanode
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cluster.startDataNodes(conf, 1, true, null, null);
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cluster.waitActive();
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final BlockManager bm = cluster.getNamesystem().getBlockManager();
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Path file1 = new Path("/test1");
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DFSTestUtil.createFile(fs, file1, 1024, (short)3, 1L);
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DFSTestUtil.waitReplication(fs, file1, (short)3);
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// Fail the first volume on both datanodes
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File dn1Vol1 = new File(dataDir, "data"+(2*0+1));
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File dn2Vol1 = new File(dataDir, "data"+(2*1+1));
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assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, false));
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assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, false));
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Path file2 = new Path("/test2");
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DFSTestUtil.createFile(fs, file2, 1024, (short)3, 1L);
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DFSTestUtil.waitReplication(fs, file2, (short)3);
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// underReplicatedBlocks are due to failed volumes
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int underReplicatedBlocks =
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BlockManagerTestUtil.checkHeartbeatAndGetUnderReplicatedBlocksCount(
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cluster.getNamesystem(), bm);
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assertTrue("There is no under replicated block after volume failure",
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underReplicatedBlocks > 0);
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}
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/**
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* verifies two things:
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* 1. number of locations of each block in the name node
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